EP 2204856 B1 20171108 - LIGHT EMITTING DIODE DRIVE DEVICE, ILLUMINATION DEVICE, IN-VEHICLE CABIN ILLUMINATION DEVICE, AND VEHICLE ILLUMINATION DEVICE
Title (en)
LIGHT EMITTING DIODE DRIVE DEVICE, ILLUMINATION DEVICE, IN-VEHICLE CABIN ILLUMINATION DEVICE, AND VEHICLE ILLUMINATION DEVICE
Title (de)
LED-ANSTEUERUNGSVORRICHTUNG, BELEUCHTUNGSVORRICHTUNG, BELEUCHTUNGSVORRICHTUNG FÜR FAHRZEUGKABINE UND FAHRZEUGBELEUCHTUNGSVORRICHTUNG
Title (fr)
DISPOSITIF DE COMMANDE DE DIODE ÉLECTROLUMINESCENTE, DISPOSITIF D'ÉCLAIRAGE, DISPOSITIF D'ÉCLAIRAGE DE CABINE EMBARQUÉ, ET DISPOSITIF D'ÉCLAIRAGE DE VÉHICULE
Publication
Application
Priority
- JP 2008067394 W 20080926
- JP 2007279684 A 20071026
Abstract (en)
[origin: EP2204856A1] A light emitting diode drive device includes a drive circuit section that applies a direct-current voltage to a light source including a plurality of light emitting diodes connected in series to allow the light source to light up, a voltage detection circuit section that detects a voltage across the light source, and a malfunction determination circuit section that determines that the light emitting diode is short-circuited when the voltage detection circuit section detects a voltage drop and a potential between the voltage before being dropped and the voltage after being dropped is equal to or more than a predetermined threshold value. Thus, it is possible to detect a fact that a light emitting diode, which lights up, is short-circuited or is not short-circuited, with a simple circuit configuration.
IPC 8 full level
H01L 33/00 (2010.01); H05B 44/00 (2022.01)
CPC (source: EP US)
H05B 45/10 (2020.01 - EP US); H05B 45/38 (2020.01 - EP US); H05B 45/385 (2020.01 - EP US); H05B 45/58 (2020.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2204856 A1 20100707; EP 2204856 A4 20140319; EP 2204856 B1 20171108; CN 101842914 A 20100922; CN 101842914 B 20120118; JP 2009111035 A 20090521; US 2010225235 A1 20100909; US 8362639 B2 20130129; WO 2009054224 A1 20090430
DOCDB simple family (application)
EP 08841637 A 20080926; CN 200880114026 A 20080926; JP 2007279684 A 20071026; JP 2008067394 W 20080926; US 73811908 A 20080926